title: Serotonergic modulation of neuronal activity in the nucleus accumbens following repeated methamphetamine administration in rats.
abstract: Electrophysiological studies were performed to determine whether serotonergic modulation in the nucleus accumbens (NAcc) was affected after repeated methamphetamine (MAP) administration. NAcc slices (400 μm) from Wistar rats administered MAP (5 mg/kg) or saline once daily for 5 days were prepared 1, 5, or 10 days after the final injection. Population spikes (PS) induced by local stimulation of NAcc were recorded. PS inhibition by serotonin was significantly attenuated in the MAP group at 5 days but did not differ at 1 or 10 days. We next analyzed the effects of serotonin receptor subtype (5-HT1A,2,3,4,6,7)-selective agonists of PS. Differences between saline and MAP groups in 5-HT1A,2,3,4,6 receptor agonist-induced changes of PS were small or not significant. Interestingly, 5-HT7 receptor agonists significantly enhanced PS in the MAP group. Changes in the secondary messenger system related to 5-HT7 receptors were also investigated. Adenylate cyclase activator-induced PS enhancements were significantly larger in the MAP group. However, dibutyryl-cAMP-induced PS enhancement was not significantly different. In conclusion, 5-HT-induced inhibition of PS in NAcc was attenuated 5 days after repeated MAP treatment: the change in the effect of 5-HT was probably due to enhancement of the excitatory modulation via the 5-HT7 receptor with adenylate cyclase signal transduction systems.
authors.affiliation: Laboratory of Neuropharmacology, Faculty of Pharmaceutical Sciences, Hiroshima International University, Japan.
authors.forename: Kumatoshi
authors.initials: K
authors.lastname: Ishihara
authors.forename: Naomichi
authors.initials: N
authors.lastname: Takahashi
authors.forename: Naoki
authors.initials: N
authors.lastname: Komoto
authors.forename: Chisato
authors.initials: C
authors.lastname: Yoshikawa
authors.forename: Shuhei
authors.initials: S
authors.lastname: Fukumoto
authors.forename: Soichiro
authors.initials: S
authors.lastname: Ide
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kimura
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ozawa
mesh_terms: D000262:Adenylyl Cyclases / Q000502:physiology*; D000818:Animals; D055724:Electrophysiological Phenomena / Q000187:drug effects*; D020536:Enzyme Activators / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D008694:Methamphetamine / Q000008:administration & dosage / Q000494:pharmacology*; D009433:Neural Inhibition / Q000187:drug effects; D009714:Nucleus Accumbens / Q000187:drug effects* / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D011985:Receptors, Serotonin / Q000502:physiology*; D015290:Second Messenger Systems / Q000502:physiology; D012701:Serotonin / Q000494:pharmacology* / Q000502:physiology; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects* / Q000502:physiology*; D013997:Time Factors
chemical_list: D020536:Enzyme Activators; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; C104425:serotonin 7 receptor; D012701:Serotonin; D008694:Methamphetamine; D000262:Adenylyl Cyclases